Amazon EBS and NVMe

With C5 and M5 instances, EBS volumes are exposed as NVMe block devices. The device
names
are /dev/nvme0n1, /dev/nvme1n1, and so on. The
device names that you specify in a block device mapping are renamed using NVMe device
names
(/dev/nvme[0-26]n1).

Working with NVMe EBS Volumes

The latest AWS Windows AMIs have AWS NVMe drivers that support Elastic Volumes.
However, if you resize your root volume on a Windows system, you must rescan the volume
in
order for the change to be recognized. If you aren't using the latest AWS Windows
AMIs, you can
install the latest AWS NVMe driver. For more information, see AWS NVMe Drivers for Windows Instances.

I/O Operation Timeout

Most operating systems specify a timeout for I/O operations submitted to NVMe devices.
On Windows systems, the default timeout is 30 seconds and the maximum is 255 seconds.
You can modify the TimeoutValue disk class registry setting using the procedure described in Registry Entries for SCSI Miniport Drivers.